The logic of neuropsychological research and the problem of patient classification in aphasia

A critical analysis is presented of the assumptions that must be made to use the data from aphasia to constrain models of normal language processing. The implication of these assumptions for patient classification and research methodology in aphasia is considered.     

Judgmental relativism as a validity threat to standardized psychiatric rating scales

Judgemental relativism is a threat to the replicability and validity of measures of client behavior from direct rating scales whenever raters are exposed to different levels of client functioning since the internal standards, or anchor points, used to judge dimensional continua may vary on the basis of prior experience. Traditional interrater reliability indexes fail to identify such effects. The influence of judgmental relativism on summated ratings from the Nurses Observational Scale for Inpatient Evaluation (NOSIE-30) for 1040 adult mentally ill clients was examined with clinical staff raters from 24 treatment units in which the Time-Sample Behavioral Checklist (TSBC) provided full-week objective measures of actual client functioning via hourly direct observational coding (DOC). Regression analyses found that the same level of objective performance received higher or lower ratings across treatment units dependent on the raters'exposure to client groups that differed in level of functioning. Analyses of rating errors found that clients with better levels of functioning relative to others within treatment units were rated even higher than performance warranted. The operation of halo and contrast effects is explored and guidelines are provided for determining when judgmental relativism may produce or nullify significant differences. DOC assessments should be used instead of retrospective ratings to support most decisions in residential settings. Specific recommendations for the application of rating scales and improving data quality are provided.This study was the basis of a master's thesis at the University of Houston by Betty E. Rich under the direction of Gordon L. Paul and Marco J. Mariotto. Richard M. Rozelle, to whom appreciation is expressed for helpful comments, served on the examination committee. This study was partially supported by grants to Gordon L. Paul from the National Institute of Mental Health, Public Health Service (MH-15353; MH-25464); the Illinois Department of Mental Health and Developmental Disabilities; the Joyce Foundation; the MacArthur Foundation; the Owsley Foundation; the Cullen Foundation; and the Center for Public Policy, University of Houston.     

Explaining the adult careers of dyslexic boys: Variations in critical skills for high-level jobs

Several hundred boys who were diagnosed as dyslexic (specifically reading disabled) in adolescence and who attended a private college preparatory school for dyslexics were followed up in adulthood. The occupations of these men, who were above average in both intelligence and socioeconomic background, were compared to those of both a control group and the general white male population. As hypothesized, the dyslexic men had higher level jobs than the average man but they were much less likely than the controls to become professionals. They rarely entered jobs such as physician, lawyer, or college teacher which require higher degrees; instead most became managers or salesmen. The occupational differences between the dyslexic and control men were related to, but not completely accounted for, by their large differences in educational attainment. Data on the competencies rated as critical to good job performance in different occupations were consistent with the hypothesis that dyslexic men would establish themselves in relatively high-level jobs emphasizing nonacademic rather than academic on-the-job skills. Nondisabled professionals rated getting information through reading among the most critical of the skills required on their jobs. In contrast, managers and salesmen rated reading as less important than nonacademic competencies such as taking initiative and responsibility or being persuasive. The results illustrate the value of knowing more about the particular competencies required in different jobs in order to help members of special groups, particularly those such as dyslexies who have specific and enduring handicaps but who are otherwise intellectually normal.     

Choice behavior of rats searching for food

The experiments reported here were designed to determine if several general principles drawn from appetitively motivated discrimination experiments in standard laboratory apparatus might also apply to food-searching behavior under more naturalistic conditions. Food-deprived rats searched for food in an open observation area. Choice behavior after finding food and after not finding food was analyzed. In all cases, not finding food in a possible food location was sufficient to direct subsequent search behavior away from that location for the remainder of the day's test. Finding food had variable effects on subsequent choice behavior, depending on the number of locations that actually contained food and the number of days food was in one location before being shifted to another. The results indicate that the rat's search strategy was influenced by food availability and distribution in ways that are predicted by discrimination learning experiments.     

Imagery,propositions, and the form of internal representations

This paper has four major sections: First, we review the basic arguments offered by Pylyshyn (Psychological Bulletin, 1973, 80, 1–24) and others against using imagery as an explanatory construct in psychology. Second, we consider each of these points and find none that speak against any but the most primitive notions of imagery. Third, we review the results of various experiments on imagery. In each case, we compare two explanations of the findings: one which assumes the existence of a surface image manifesting emergent properties, and one which assumes that all internal representations are coded in terms of “abstract propositions.” We find imagery hypotheses to be at least as adequate as those based on propositional representation. Finally, we conclude that debate about the ultimate foundations of internal representation is fruitless; the empirical question is whether images have properties that cannot be derived directly from more abstract propositional structures.     

Token test performance by dyslexic adolescents

An abbreviated form of the Token Test was administered to 42 normal readers and 42 dyslexic adolescent males. The greatest divergence between the two groups was seen on Part V where syntactic complexity varies. An error analysis also supported the hypothesis that some, but not all, dyslexics have an impaired ability to process syntactic information. The Token Test, particularly Part V, would be a useful aid in the evaluation of dyslexic individuals.     

Closed- and open-class lexical access in agrammatic and fluent aphasics

Bradley, Garrett, and Zurif (Bradley, Computational distinctions of vocabulary type. Unpublished doctoral dissertation, MIT Press; Cambridge, MA, 1978; Biological studies of mental processes, MIT Press, Cambridge, MA, 1980) have suggested that closed-class word access is normally mediated by a different route than the open-class one, and that the loss of this closed-class route might account for agrammatism. However, in an earlier study ( Gordon & Caramazza, Brain and Language, 15, 143–160, 1982) we were not able to confirm a meaningful difference between closed- and open-class word frequency responsiveness of the type Bradley (unpublished dissertation, 1978) had seemed to find in normal subjects. We have now done a direct comparison of closed-class frequency sensitivity in agrammatic and nonagrammatic aphasics, to directly test Bradley and colleagues' hypotheses and to avoid some of the experimental problems with between-class frequency comparisons. We find that closed-class words behave similarly whether or not the subject is agrammatic. Therefore, the differences between agrammatic and nonagrammatic aphasics must arise at a deeper level (or levels) of lexical processing than the one probed by the frequency sensitivity effect.     

Assortative marriage and the familiality of cognitive abilities in families of extremely gifted students

The top 1% of the extremely bright students identified by the Study of Mathematically Precocious Youth (Benbow & Stanley, 1980b) were tested along with their parents, using a battery of specifically designed cognitive tests. These students represented the top 0.03% of their age group in intellectual ability. The results showed that the parents were extremely able and resembled one another significantly more than parents in the general population. In addition, the intellectually precocious children resembled their parents to a lesser extent than children of average ability resemble their parents. These results suggest that considerable assortative mating has occurred among the parents of these extremely gifted youth, but that extreme giftedness cannot be predicted reliably solely as a result of the mating of bright parents.     

The selective impairment of phonological processing: A case study

A case study is reported of an aphasic patient with fluent speech and markedly superior comprehension of written vs. spoken words. Results of extensive testing supported the hypothesis that the patient suffers from a phonological processing deficit that affects performance in all tasks that require the generation of a phonological code. This selective deficit is interpreted as the underlying cause of diverse symptoms such as asyntactic comprehension of written sentences, the commission of spelling errors in writing, and the production of literal paraphasias and neologisms in spontaneous speech. Alternative possibilities for the classification of this patient are discussed.